Why it's interesting

The number of qualified referrals, used by Trivago to measure unique users on its website, rose to 155.7 million in Europe.

In markets outside of Europe and the Americas, referrals more than doubled to 110.6 million.

The group said increased brand awareness had helped drive the increased number of visitors. The brand's TV adverts, fronted by Gabrielle Miller, more commonly called "the Trivago girl" have become a hit on social media.